Re: [Xen-devel] [PATCH v3 3/9] libxl_internal: Introduce libxl__ev_devlock for devices hotplug via QMP

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Anthony PERARD writes ("[PATCH v3 3/9] libxl_internal: Introduce 
libxl__ev_devlock for devices hotplug via QMP"):
> The current lock `domain_userdata_lock' can't be used when modification
> to a guest is done by sending command to QEMU, this is a slow process
> and requires to call CTX_UNLOCK, which is not possible while holding
> the `domain_userdata_lock'.
> 
> To resolve this issue, we create a new lock which can take over part
> of the job of the json_lock.
> 
> This lock is outside CTX_LOCK in the lock hierarchy.
> libxl__ev_devlock_lock will have CTX_UNLOCK before trying to grab the
> ev_devlock. The callback is used to notify when the ev_devlock have
> been acquired.
> 
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Thanks.

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

And committed the series.

Ian.

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